[GPS_Standard] My GPSstd_PLL software is now available

[Bob Stewart]

Hello everyone,

I finally have my PLL version of Bert's code running and stable.  It is available at "http://www.evoria.net/AE6RV/GPSstd_PLL/".  The Archives directory is closed, but "Version 0.6" is available in both a .hex file and the .asm source code.  You could consider V0.6 a late beta version, but only because I still want to add a few features.   JimD, JG1KGS, has been helping me with testing for a few weeks now, and we have not had any problems for the past 2 versions.  He has a pretty sophisticated shop, and has been a big help in 
validating the accuracy of the output, as I will not have a Rubidium 
standard until sometime next week.

As mentioned in an earlier post, you will have to jumper pin 9 and pin 11 on the PIC for this software to work.  It is a true PLL, not an averaging system.  Except for the "X" control parameter, which sets the OCXO tuning slope, it is just plug and play.

If you are a current user of Bert's code, everything will be pretty familiar.  However, the "S" control parameter is now gone, as it serves no purpose in a PLL.  You will also notice that my software outputs a line every single second.  I have also re-purposed the "M" control as a "warmup" parameter.  It sets the number of minutes to stay in warmup mode before starting the PLL.  Currently I am studying the sawtooth data from my UT+ with the intent to add software to correct for it.

There is a very primitive README file there, which I hope to expand into a usable document in the future.

I realize it's asking a lot to get people to try this, but if you are looking for the advantages a PLL will bring to Bert's board, please consider giving this a try.

Disclaimer: I do not sell chips, knock-off versions of Bert's boards, or any other product, nor do I have plans to do so.  This is just what it appears to be: alternative software for Bert's board.

Thanks for reading.

Bob - AE6RV